fish, sharks , whales , jelly fish , sea turtle , lobster, star fish , water plants,put them in food web?

Answer 1

Just connect these according to what eats what. Usually you put the producers at the bottom of the page because they're the start of the food web. Then add other levels as you show what eats the producers, etc.

So the water plants go at the bottom.
Draw arrows from the food to the eater.